JPH01163521A - Post purging control device for combustion equipment - Google Patents

Abstract

PURPOSE:To eliminate a feeling of cold air and further prevent an abnormal heating of equipment body by a method wherein a time to calculate a combustion time, a time in which an integration timer may output a signal to a fan motor controlling part and a time in which an operation switch is turned on during a previous post-purge are calculated into a post-purge time. CONSTITUTION:A combustion sensor 30 may convert a flame signal into an electrical signal and a combustion sensor 31 may defect a combustion with an electrical signal got by a combustion sensor 30. A combustion timer 32 may count a combustion time and a calculation part 33 may calculate a timer value in respect to the combustion time. An integration timer 34 may determine a post-purge time on the basis of a timer value from the calculation part 33, a time in which a signal outputted to a fan motor controlling part 29 and a calculated value in which an operation switch 23 is turned on during a previous post-purge and its stored value is applied. Even if the operation switch 23 is turned off, an operating signal is outputted to the fan motor controlling part 29 during the post-purge time, a maximum value discriminating part 35 may determine an upper limit value of the integration timer 34. With this arrangement, it is possible to prevent a feeling of cold air and an abnormal heating of the equipment during the post-purge.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 3...-7 The present invention relates to combustion devices for various fields, mainly heaters and water heaters that use gas, oil, etc. as fuel and perform combustion.

Conventional technology In recent years, with the introduction of electronic technology such as microcomputers, post-purge control devices for combustion appliances have changed from conventional devices that detect the body temperature using a bimetal switch and perform post-purge control to internal timers such as microcomputers. As a result, there is a shift to a control system in which post-purge is performed for a fixed period of time, and post-purge control using electronic technology such as a microcomputer is becoming more important.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the above-mentioned conventional post-purge control device for a combustion appliance will be described below with reference to the drawings.

FIG. 3 shows a block diagram of a conventional post-purge control device for a combustion appliance. In FIG. 3, 1 is an outlet. 2 is a fan for blowing air. 3 is a fan motor drive unit, which drives the ventilation fan 2. 4 is a transformer. 5 is a rectifier, which performs full-wave rectification of the AC power source. Reference numeral 6 denotes a smoothing capacitor, which smoothes the DC power obtained by the rectifier 5. 7 is resistance.

Reference numeral 8 is an operation switch for the appliance, which turns on and off the power to the appliance. Reference numeral 9 denotes a determination section consisting of a microcomputer, which determines and controls the operation of the appliance based on the signal from the operation switch 8. Reference numeral 10 denotes a combustion control section which performs combustion control based on a signal from the operation switch 8. Reference numeral 11 denotes a fan motor control section, which outputs a control signal to the fan motor drive section 3. Reference numeral 12 denotes a delay control section including a delay timer, etc., which outputs a signal to operate the fan motor control section 11 for a certain period of time after the operation switch 8 is turned off.

The determination section 9 includes a combustion control section 10 and a fan motor control section 1.
1 and a delay control section 12.

13 is an igniter. 14 is a solenoid valve, and combustion control section 1
A signal from 0 turns the fuel supply on and off.

A burner 15 performs combustion.

The operation of the post-purge control system for the NF combustion appliance constructed as described above will be explained below.5.

do.

First, the commercial power source obtained through the outlet 1 is stepped down by the transformer 4, and then full-wave rectified by the rectifier 5.
Due to the smoothing capacitor 6, the smoothness nf becomes a direct current. The control described later is performed using the DC power supply obtained by the above method. If the operation switch 8 is operated by a person, the combustion control section 10 and
A signal is sent to the fan motor control unit 11, which operates the igniter 13 and solenoid valve 14, respectively, and starts combustion by the burner 15. Alternatively, the fan motor drive section 3 is operated to drive the ventilation fan 2. Next, when the operation switch 8 is turned off, the combustion control section 1o receives the OFF signal from the operation switch 8, and stops the solenoid valve 14 to stop combustion. When the operation switch 8 is turned off, the delay control section 12 outputs an operation signal to the fan motor control section 11 and rotates the blower fan 2 for a certain period of time even though the operation switch 8 is turned off.
Prevents abnormal heating of the vessel.

Problems to be Solved by the Invention However, in the above configuration, the operation switch 6...
- The delay control unit 12 operates only when the notch 8 is turned on and off, and the blower fan 2 operates regardless of whether the vessel is heated or whether the appliance is burning, so cool air is emitted from the appliance. In particular, heaters have the problem of reducing the feeling of use due to the feeling of cold air.

In view of the above-mentioned problems, the present invention provides a post-purge control device that operates a blower fan so as not to give a feeling of cold air during post-purge, and prevents the vessel from overheating, which is the original purpose.

First Means for Solving the Problems To solve the above problems, the combustion appliance host purge control device of the present invention includes an operation switch that turns on and off the operation of the appliance, and an on/off signal for the operation switch. A determination section that controls each part, an electromagnetic valve that turns on and off the supply of fuel according to a combustion control signal from the determination section, an igniter that ignites the fuel, and a fan motor control signal that also outputs from the determination section. A fan motor drive unit that operates, a burner that performs combustion when the electromagnetic valve and the igniter operate, and a flame signal sent to the burner as an electric signal and judgment 7.
\-.

What is the combustion sensor that transmits the information to the combustion sensor and the blower fan that is controlled by the fan motor drive unit and blows air? a fan motor control section that similarly outputs a large signal from the operation switch to the fan motor drive section; a combustion detection section that detects the presence or absence of combustion based on an electric signal from the combustion sensor; and a combustion detection section that detects combustion by the combustion detection section. a combustion timer that counts the waiting time determined as a sound; a calculation unit that calculates the nL time obtained by the combustion timer and sets it to a timer length suitable for the appliance; and a calculation unit that calculates the nF timer length that is calculated by the calculation unit. It has the function of adding , and subtracting the time during which it outputs a signal to the fan motor control section, and when the operation switch is turned off,
The calculation result of the operation signal to the fan motor control section, the length of the f co-timer calculated by the calculation section, the time during which the signal is outputted by itself to the fan motor control section, and the storage time of the previous calculation value is constant. If the operation switch is turned on until the calculated value is below a certain value, or the operation switch is turned on until the calculated value is below a certain value, the operation signal to the fan motor control section is stopped, and the calculated value at that time is A delay timer section is used to control an accumulation timer for storage and a maximum value determination section for determining an upper limit value of the accumulation timer.

Function The present invention detects the combustion time using the above configuration, calculates the combustion time, and calculates the combustion time, the time during which the integration timer outputs its own signal to the fan motor control section, and the previous post-purge. Since the post-purge time is calculated from the memorized time by turning the operation switch on during operation, the post-purge time can be adjusted to the combustion time, and there is no feeling of cold air. Abnormal heating of the vessel body can be prevented even when sudden operations such as repeated combustion and operation switch-off operations are performed.

EXAMPLE Hereinafter, a post-purge control device for a combustion appliance according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the port 91 of the combustion appliance in the embodiment of the present invention.
−.

1 shows a block diagram of a stoppurge control device. In FIG. 1, 16 is an outlet.

17 is a fan for blowing air. A fan motor drive section 18 drives the ventilation fan 17.

19 is a transformer. 2o is a rectifier which performs full-wave rectification of the AC power source. 21 is a smoothing capacitor;
The DC power obtained by the rectifier 20 is smoothed. 22 is a resistance. Reference numeral 23 is an operation switch that turns on and off the power to the appliance. Reference numeral 24 denotes a determination section consisting of a microcomputer, which determines and controls the operation of the appliance based on the signal from the operation switch 23. Reference numeral 25 denotes a combustion control section which performs combustion control based on a signal from the operation switch 23.

26 is an igniter. 27 is a solenoid valve. Igniter 26
The solenoid valve 27 is controlled by a signal from the combustion control section 25. 28 is a burner that performs combustion. A fan motor control section 29 controls the ventilation fan 17 via the fan motor drive section 18 . 30 is a combustion sensor that converts a flame signal into an electrical signal. 31 is a combustion detection section, and the combustion detection section is 10\.

Combustion is detected by an electrical signal obtained by the combustion sensor 3o. 32 is a combustion timer that counts combustion time.

33 is a calculation unit that calculates a timer value for the combustion time. 34 is an integration timer, and the timer value from the calculation unit 33, the time during which the integration timer 34 outputs its own signal to the fan motor control unit 29, and the operation switch 23 being turned on during the previous post-purge, The post-purge time is determined based on the calculated value at the time of memorization, and an operation signal is output to the fan motor control unit 29 during the post-purge time even if the operation switch 23 is turned off.

35 is a maximum value determining section, which determines the upper limit value of the integration timer 34. 36 is a delay timer section, which is composed of an integration timer 34 and a maximum value determination section 35; 32, an arithmetic unit 33, and a delay timer unit 36.

The operation of the post-purge control device for a combustion appliance constructed as described above will be explained below with reference to FIGS. 1 and 2.

First, FIG. 2 shows changes in the cumulative timer length over time. Commercial power is taken into the circuit via an outlet 16, stepped down by a transformer 19, and rectifier 2.
After being full-wave rectified at 0, it is smoothed by a smoothing capacitor 21 and becomes a direct current.

Control is performed using the DC current obtained in this way. When the operation switch 23 is turned on, a signal is sent to the combustion control section 25 and the fan motor control section 29 to operate the igniter 26 and the solenoid valve 27, respectively, and cause the burner 28 to start combustion. Alternatively, the fan motor drive section 18 is operated to drive the ventilation fan 17. The combustion state is converted into an electrical signal by the combustion sensor 30 and sent to the combustion detection section 31. The combustion detection unit 31 outputs an electric signal from the combustion sensor 30 to the combustion timer 32 only when determining combustion, and causes the combustion time to be counted. Arithmetic unit 3
3 calculates the value of the combustion timer 32.

The integration timer 34 calculates the elapsed time tO~, which will be explained according to the second
During t2, the combustion sensor 3o detects a combustion signal, and after the combustion timer 32 has passed, the calculation unit 33 calculates the r value and adds it to the integration timer 34, and at tl, the maximum value determination unit 35, the upper limit of the cumulative timer length is Pt
It is limited to M. Then, when the operation switch 23 is turned off at t2, an operation signal is output from the integration timer 34 to the fan motor control section 29 and is subtracted from the integration timer 34 during the elapsed time t2 to t3. Then, when the operation switch 23 is turned on again at t3, the cumulative timer length PT1 at that time is stored and at the same time, the operation signal to the fan motor control section 29 is stopped.

During the elapsed time t3 to t4, the combustion signal is detected again.
In this state, it is added to the cumulative timer length PT1 in the same manner as described above. At t4, turn off the operation switch 23 again.
For example, during the elapsed time period t4 to t5, the operation signal is output to the fan motor control section 29 and subtraction is continued from the integration timer 34, as described above, until the integration timer length reaches PTo. While the integration timer 34 is outputting an operation signal to the fan motor control unit 29, the ventilation fan 17
The rotation is performed even though the operating shaft 13 is turned off and the post-purge operation is performed.

As described above, according to this embodiment, there is a combustion sensor 30 that converts a flame signal into an electrical signal, a combustion detection unit 31 that burns in response to an electrical signal from the combustion sensor 3, and a combustion timer 32 that counts the combustion time. and a calculation unit 33 that calculates a timer value based on the combustion time, the timer value from the calculation unit 33, the time during which the signal is output to the fan motor control unit 29 during the post-purge operation, and the time during the previous post-purge operation. By providing an integration timer 34 that determines the post-purge time based on the calculated value stored when the operation switch 23 is turned on, and a maximum value determination section 35 that limits the upper limit of the integration timer 34, the post-purge can be performed. It can prevent the feeling of cold air inside and abnormal heating of the equipment.

Effects of the Invention As described above, the present invention includes an operation switch that turns on and off the operation of the appliance, a determination section that determines the on/off signal of the operation switch and controls each part, and a fuel supply system that uses the combustion control signal from the determination section. a solenoid valve that turns on and off 14 . , a burner that performs combustion during operation, a combustion sensor that converts a flame signal in the burner into an electric signal and transmits it to the determination section, and a blowing fan that blows air controlled by the fan motor drive section, and the determination section a combustion control section that operates in response to a large signal from the operation switch and outputs a combustion control signal; a fan motor control section that also outputs an output to the fan motor drive section in response to a large signal from the operation switch; and an electric signal from the combustion sensor. , a combustion detection unit that detects whether there is combustion, a combustion timer that counts the waiting time when the combustion detection unit determines that there is combustion, and nf obtained by the combustion timer.
A calculation unit calculates the waiting time and sets it to a timer length suitable for the appliance, and adds the timer length t'Lr calculated by the calculation unit, and outputs the signal itself to the fan motor control unit. It has the function of subtracting, and when the operation switch is turned off, it sends an operation signal to the fan motor control section of 1.
To 5/1/ The calculation result of the timer length calculated by the calculation unit, the time during which the signal is outputted by itself to the fan motor control unit, and the storage time of the previous calculation value is outputted until it becomes less than a certain value. or an integration timer that stops the operation signal to the fan motor control section and stores the calculation value at that time when the operation switch is turned on before the calculation value becomes a certain value or less, and the integration timer By providing a delay timer section with a maximum value determination section that determines the upper limit value of There is nothing to do,
In particular, with the ζ heater, a good post-purge experience can be obtained. Abnormal heating of the device body can be prevented even in the case of malicious operations such as repeating combustion and operation switch-off operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a post-purge control device for a combustion appliance in an embodiment of the present invention, and FIG. 2 shows changes in the integration timer length over time in an embodiment of the present invention.
3 is a block diagram of a post-purge control device for a combustion appliance in a conventional embodiment. 17...Blower fan, 23...Operation switch, 24...Judgment unit, 26...
Igniter, 27... Solenoid valve, 28... Burner, 30... Combustion sensor, 36...
・Delay timer section.

Claims (1)

[Claims] An operation switch that turns on and off the operation of the appliance, a determination unit that determines the on/off signal of the operation switch and controls each part, an electromagnetic valve that turns on and off the supply of fuel based on the combustion control signal from the determination unit, and the fuel. a fan motor drive unit that also operates according to a fan motor control signal from the determination unit; a burner that performs combustion when the solenoid valve and the igniter operate; and a flame signal in the burner. It has a combustion sensor that transmits an electric signal to a determination section, and a blowing fan that is controlled by the fan motor drive section and blows air, and the determination section is operated by an input signal from the operation switch and outputs a combustion control signal. a fan motor control unit that similarly outputs an output to the fan motor drive unit in response to an input signal from the operation switch; a combustion detection unit that detects the presence or absence of combustion based on an electric signal from the combustion sensor; a combustion timer that counts the time when combustion is determined to be present by the combustion timer; a calculation unit that calculates the time obtained by the combustion timer to determine a timer length suitable for the appliance; and a timer length calculated by the calculation unit. and has the function of subtracting the time during which it outputs its own signal to the fan motor control section, and when the operation switch is turned off, the operation signal is sent to the fan motor control section, and the operation signal is output to the fan motor control section. The output is continued until the calculation result of the timer length calculated by the unit, the time during which it outputs its own signal to the fan motor control unit, and the storage time of the previous calculated value becomes a certain value or less, or the calculated value is an integration timer that stops the operation signal to the fan motor control unit when the operation switch is turned on before the value becomes below a certain value, and stores the calculated value at that time; and a maximum value that determines the upper limit of the integration timer. A post-purge control device for a combustion appliance, comprising a value determination section and a delay timer section.